diff --git a/pwm_block/src/pwm_core.v b/pwm_block/src/pwm_core.v
index 9a63760..3470b8c 100644
--- a/pwm_block/src/pwm_core.v
+++ b/pwm_block/src/pwm_core.v
@@ -25,10 +25,8 @@ module pwm_core #(
 
 reg [WINDOW_REG_SIZE-1:0] duty_counter;
 
-always @ (posedge(clk), rst) begin
-	if (rst)
-		duty_counter <= 0;
-	else if (duty_counter == window_width)
+always @ (posedge(clk), posedge(rst)) begin
+	if (rst || duty_counter >= window_width - 1)
 		duty_counter <= 0;
 	else
 		duty_counter <= duty_counter + 1;